Amy is in a car moving quickly toward a stationary siren. Just as Amy moves

past the siren, she notices a change in the _of the siren.

What would cause entropy to decrease in a reaction

What do all elements in group 2 have in common

Which of these statements is true about endothermic reactions, but not about exothermic reactions? The reactants and products are different substances. The reactants have less energy than the products. The temperature of the container increases.

What most determines the entropy of a solid? A. The mobility of electrons in the solid B. The crystalline structure of the solid C. The specific heat capacity of the solid D. The enthalpy of formation of the solid

What is the empirical formula of a compound that has three times as many hydrogen atoms as carbon atoms, but only half as many oxygen atoms as carbon atoms atoms?

Which outcome is not caused by gravitational force?

Explain the properties of the substance around us depend on the atoms and molecules that compose them

What is an ion (1 mark) what is the charge on a chloride ion (1 mark) what is an ionic bond (1 mark)

Why do northern lights appear in different colors? Because charged particles of solar wind ignite different gases in Earth's atmosphere Because electrons and protons of solar wind ignite the plasma present in the corona Because electrons and protons

Which organ system consists of the following levels of organization? kidney cells - - > kidney tissues - - > kidney A. excretory B. circulatory C. respiratory D. integumentary